The AAF Flanders Pre-Pleat 40 LPD air filter offers high filtration to protect your HVAC system and indoor air against particulates while also minimizing air pressure drop off to keep your system running at peak efficiency. This filter has the lowest pressure drop and highest dust holding capacity in the industry, no other filter can say that.

Available in almost any size to fit almost any heating or cooling system

Easy to install and replace every 90 days

Made to the exact size, no more confusion with filter sizes

Manufactured in the USA by AAF Flanders

Be sure you have measured your existing filter before placing an order, some manufacturers undercut filters so you should never base it off the label. Exact/custom filters are not eligible for returns or exchanges. Manufacturing tolerances of plus 0, minus 1/8" will be observed on overall width and length of filter. Picture is used as a reference, sizes will vary. Filters larger than 25x30x1 are considered a double filter where there is additional strength down the middle of the filter. It's our policy to list the smallest dimension first. When the filters arrive the label will be displayed as such, this will not impact compatibility - it's just a matter of how you hold the filter. If you have questions or concerns please contact us.